WO2004051836A1

WO2004051836A1 - Starting device for single-phase induction motor

Info

Publication number: WO2004051836A1
Application number: PCT/JP2003/015191
Authority: WO
Inventors: Mikio Sahashi; Akihiko Matsuya; Shinichi Iwasaki; Motoi Okada; Kazuo Itoh
Original assignee: Yamada Electric Mfg. Co., Ltd.; Matsushita Refrigeration Company
Priority date: 2002-11-29
Filing date: 2003-11-27
Publication date: 2004-06-17
Also published as: AU2003302543A1; EP1605580A4; US7515029B2; EP1605580A1; KR20050085204A; US20060163956A1; AU2003302543A8

Abstract

When a starting current runs through an auxiliary winding (S), a main PTC (12) and an auxiliary PTC (14) undergo self-heating for an increased electric resistance. When the auxiliary PTC (14) is heated to 140°C, a snap-action bimetal (18) is turned off to stop a current flow to the main PTC (12) and completes the starting of a single-phase induction motor (70). With the bimetal (18) off, a feeble current runs through the auxiliary PTC (14) side only to keep the bimetal (18) off by heat generated by the current.

Description

Description Single-phase induction motor starter Technical field

The present invention relates to a starting device for a single-phase induction motor such as an electric refrigerator (closed electric compressor) or a pump motor. Background art

For example, a starting device is often provided in a single-phase induction motor that drives a hermetic compressor such as a refrigerator or an air conditioner. As a conventional starting device of this type, as shown in FIG. 27 (A), a positive characteristic thermistor is connected in series with an auxiliary winding S energized by an AC power supply 90 together with a main winding M. A configuration that connects the two is provided. In such a starting device, when the single-phase induction motor 100 is started, the starting current flows through the auxiliary winding S because the positive characteristic thermistor 312 exhibits a low electric resistance value. The starting current increases the positive resistance of the positive characteristic resistor 312, limiting the current to the auxiliary winding S. In this configuration, even during steady-state operation after the start of the single-phase induction motor, the power supply voltage is applied to the positive characteristic thermistor 312 and self-heating continues, so that about 2 to 4 W of power is always It consumes energy and has a problem in energy saving.

Further, the conventional starting device has a problem that it is difficult to restart the single-phase induction motor 100 immediately after stopping it. In other words, since the temperature of the positive characteristic sensor for startup 312 is large, the heat capacity is large.If the temperature becomes high and the resistance becomes high during operation, after the motor 100 is stopped, the temperature drops to near normal temperature and it can be restarted. It takes tens of seconds to several minutes to reach the state, and if it is attempted to restart before that, since the positive characteristic thermistor 312 has a high resistance, only a small current flows through the auxiliary winding S. However, the motor 100 was in the rotor locked state, a large current was flowing through the main winding M, and the overload relay 50 was activated and could not be restarted. Since the return time of the overload relay is initially shorter than the cooling time before the positive characteristic thermistor 312 can be restarted, the overload relay is repeatedly operated and restored several times, and is sequentially performed. When returning to high temperature The interval becomes longer. Then, since the return time of the overload relay was longer than the positive characteristic thermistor 312, the electric motor 100 could be started. In such a situation, in the refrigerator compressor, the temperature inside the refrigerator decreases, and the thermostat turns off. This has occurred in cases such as In such a case, not only does restarting take time, but also the life of the overload relay described above is shortened.

For this reason, the present applicant has proposed a starting device for a single-phase induction motor having a configuration shown in FIG. 27 (B) as Japanese Patent Application Laid-Open No. 6-38467. In this circuit, in the starting device 210, a bimetal 218 is provided in series with the positive characteristic thermistor 310, and the bimetal 218 is provided in parallel with the positive characteristic thermistor 321. By heating 2 18, the current to the positive characteristic thermistor 3 12 is cut off. Positive characteristic thermistor The low power consumption was achieved by maintaining the off state of the bimetal 218 by using the resistance 2 14 that consumes less power than 312. Further, Japanese Utility Model Application Laid-Open No. 56-38276 discloses an activation device in which a characteristic thermistor is divided into two parts and arranged.

In addition, the starter with positive temperature coefficient thermistor has a socket terminal to connect to the connection pin provided on the single-phase induction motor side so that it can be easily mounted on the single-phase induction motor. There is something. For example, three connection pins protrude from the single-phase induction motor as shown in the actual open-ended 62-1115760, and electrical connection is made to the socket terminals of the starter.

Motors and the like cause very large vibrations in electrical equipment.In addition, when the equipment is damaged or removed during inspection, or when re-installed after removal, if the socket terminal has a weak grip, contact between the starting device and the electrical equipment may occur. Will be insufficient. In particular, in the case of a starting device for starting a large motor, the contact part is heated and the terminal is damaged, so that it cannot function as a PTC relay device. Furthermore, there is no denying the possibility of fires.

FIG. 28 (A) shows a plan view of the socket terminal incorporated in the starting device according to the prior art, FIG. 28 (B) shows a cross section, and FIG. 28 (C) shows a bottom view. When this socket terminal 122 is attached to the connection pin 212 as shown in FIG. 288 (F), a stress mainly caused by a twist in the X and Y two directions (hereinafter referred to as a “torsion force”). Join. This As a result, the socket terminals 122A may not expand and return to the original state due to the effect of the twisting force as shown in Fig. 28 (G). As a result, the gripping force of the connection pins 2 1 and 2 by the socket terminals 1 and 2 A is greatly reduced, and the contact resistance increases due to poor contact. I do. To cope with such a problem, Japanese Patent Application Laid-Open Nos. 8-149970, 2001-33332159 and the like have been proposed. Japanese Patent Application Laid-Open No. 8-149770 proposes a cylindrical socket terminal having grooves at four places along the insertion / removal direction of the connection pin. In Japanese Patent Application Laid-Open No. 8-149770, a socket terminal is composed of a grip portion and a support portion, and when a grip force is generated in the grip portion, the socket terminal expands and absorbs stress. A technology for providing a unit has been proposed. On the other hand, Japanese Patent Application Laid-Open No. 2000-3312159 proposes a technique in which a convex portion for preventing the socket terminal from expanding is provided near the slit-shaped opening of the socket terminal. I have.

However, in the starting device disclosed in Japanese Patent Application Laid-Open No. 6-38467, since the bimetal 218 is kept off by the resistor 214, the power consumption is reduced by one unit compared with the circuit configuration shown in FIG. The limit was three. In the Japanese Utility Model Application Publication No. 56-38276, since the positive characteristic thermistor is divided into two parts, the power consumption could only be reduced to half.

In addition to the power consumption described above, in the starter disclosed in Japanese Patent Application Laid-Open No. Hei 6-38467, since the heat capacity of the resistor 216 for maintaining the bimetal 218 in the off state is large, it is necessary to restart the single-phase induction motor. It could not be done quickly. Similarly, in Japanese Utility Model Laid-Open Publication No. 56-38276, since the positive characteristic thermistor was divided into two, the restart time could only be reduced by half.

The present invention has been made to solve the above-described problems, and an object of the present invention is to minimize power consumption during steady-state operation due to a positive-characteristic thermistor for starting, thereby achieving energy saving. It is an object of the present invention to provide a starting device for a single-phase induction motor that can perform the operation.

In addition, the cylindrical socket terminal disclosed in Japanese Patent Application Laid-Open No. 8-149770 has a problem that the arc-shaped part divided by the groove concentrates stress partially due to the rib effect and is easily deformed. . On the other hand, the socket terminal having the joint piece of Japanese Patent Application Laid-Open No. 8-149770 has a poor space efficiency because the joint piece protrudes to the side, so that it is difficult to use a starter. Difficult to accommodate. The socket terminal disclosed in Japanese Patent Application Laid-Open No. 2001-3319259 has a problem that the space efficiency is deteriorated because the socket terminal is provided with a projection separately from the socket terminal, and it is difficult to accommodate the socket terminal in the starting device.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a highly reliable single-phase induction motor starting device capable of maintaining a holding force of a socket terminal for a long period of time. Is to do. Disclosure of the invention

In order to achieve the above object, the invention of claim 1 is directed to a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing,

Positive characteristic noise connected in series with the auxiliary winding,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; a series connection of the auxiliary winding and the positive characteristic thermistor connected in series to sense heat from the auxiliary positive characteristic thermistor; A snap action bimetal that turns off when this reaches the set temperature,

A technical feature is provided in the casing, comprising: a sealed chamber for sealing the snap function bimetal and the auxiliary positive characteristic ceramics.

To achieve the above object, according to claim 5, in a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing,

A positive characteristic thermistor connected in series with the auxiliary winding;

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; a series connection of the auxiliary winding and the positive characteristic thermistor connected in series to sense heat from the auxiliary positive characteristic thermistor; Bimetal that turns off when this reaches the set temperature,

A closed chamber provided in the casing, for sealing the bimetal and the auxiliary positive temperature coefficient thermistor;

A magnet for applying a magnetic force to bias the contact to the on side with respect to the bimetal; It is a technical feature that it is provided.

In claim 7, a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; a temperature-sensitive magnet that senses heat from the auxiliary positive characteristic thermistor and demagnetizes the temperature to reach a set temperature;

The auxiliary winding and a positive characteristic thermistor are connected in series with each other in series, and are turned on by being attracted by the magnetic force of the temperature-sensitive magnet and turned off by demagnetization of the temperature-sensitive magnet. And a closed chamber for sealing the switch.

In claim 8, a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic sum; a temperature-sensitive magnet that senses heat from the auxiliary positive characteristic thermistor and demagnetizes it to a set temperature;

A lead switch connected in series with the series circuit of the auxiliary winding and the positive temperature coefficient thermistor, and turned on by the magnetic force of the temperature-sensitive magnet and turned off by demagnetization of the temperature-sensitive magnet. Features.

According to the starting device for a single-phase induction motor according to claim 1, when the single-phase induction motor is started, since the positive characteristic thermistor has a low resistance, the auxiliary winding is connected via a series circuit of the positive characteristic thermistor and the snap action bimetal. Starting current flows through the line, and the single-phase induction motor starts. When the start-up current flows, the positive characteristic thermistor self-heats and has a high resistance, and a large amount of current flows to the auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor. When the temperature of the auxiliary positive characteristic thermistor reaches the set temperature, the snap-action bimetal turns off, no current flows in the positive characteristic thermistor, and the single-phase induction motor completes startup and enters steady operation. When the snap action bimetal is turned off, current flows only to the auxiliary positive characteristic thermistor and heat is generated, and the generated heat keeps the snap action bimetal off.

Therefore, during steady-state operation of the single-phase induction motor, current does not flow in the positive characteristic error, and instead, current flows in the auxiliary positive characteristic error. The current flowing in the evening is extremely small enough to generate heat for holding the snap-action bimetal in the off state in the auxiliary positive characteristic summit, and the power consumption due to the auxiliary positive characteristic Positive characteristic thermis Power consumption is much less than evening power consumption.

In particular, the snap action bimetal and the auxiliary positive temperature coefficient thermistor are housed in a closed room inside the casing, so it is difficult for heat to escape to the outside, and the snap action bimetal is kept off with extremely low power consumption. be able to. In addition, even if a flammable gas (a hydrocarbon compound such as butane) is used as the refrigerant for the hermetic compressor and the refrigerant leaks, it is housed in a closed chamber. Does not ignite due to sparks during opening and closing operations.

Also, during the steady-state operation of the single-phase induction motor, the starting positive temperature coefficient thermistor with a large heat capacity is cooled to room temperature. On the other hand, in the case of the auxiliary positive characteristics, the cooling is quick because the heat capacity is small. Therefore, even when the single-phase induction motor is restarted immediately after it stops, the auxiliary positive characteristic failure is immediately cooled down to near normal temperature, and the time required for restart is several seconds to several tens of seconds. As a result, the overload relay can be restarted quickly without repeating the operation and return to operation as in the conventional technology.

In addition, since a small auxiliary positive temperature coefficient thermistor is used for heating the bimetal, it is not affected by voltage fluctuations and has a correction effect on changes in ambient temperature.

According to claim 2, the snap action bimetal includes a movable contact plate that swings a movable contact, a bimetal, and a half-section interposed between a first support point of the movable contact plate and a second support point of the bimetal. It consists of a circular panel panel. When the second support point is closer to the tip position of the bimetal at low temperature than the line connecting the fulcrum of the movable contact plate and the first support point, the panel panel moves so that the movable contact presses the movable contact against the fixed contact. contact Energize the board. Then, when the second support point is closer to the distal end position of the bimetal at a high temperature than the line connecting the fulcrum of the movable contact plate and the first support point, the panel panel separates the movable contact point from the fixed contact side. The movable contact plate is urged as described above. This allows the snap action bimetal to break the contacts quickly. Therefore, the arc does not continue and there is no rough contact or noise. When the contact pressure becomes zero, the connection continues for a short period of time. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time.

In claim 3, the snap action bimetal includes a drawn bimetal. According to a fourth aspect of the present invention, the snap action bimetal is provided with a bimetal that is formed in a substantially circular shape at a central portion. This allows the snap action bimetal to break the contacts quickly. Therefore, the arc does not continue and there is no rough contact or noise. The connection is kept for a short time when the contact pressure is zero, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs over a long period of time.

In claim 5, the bimetal having the contact on the free end side is urged toward the contact on side by the magnetic force of the magnet. When the bimetal turns off, the magnetic force from the magnet decreases in inverse proportion to the square of the distance. Bimetal receives the strongest magnetic force when the contacts are on, and the magnetic force decreases rapidly after the contacts are separated, so the contacts can be disconnected quickly. Therefore, the arc does not continue and there is no rough contact or noise. The time to continue connection when the contact pressure is zero is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time. In claim 6, the auxiliary positive characteristic thermistor contacts the base of the bimetal. Therefore, heat from the auxiliary positive characteristic thermistor can be efficiently transmitted to the bimetal, and the bimetal can be kept off in the auxiliary positive characteristic thermistor with low power consumption.

According to claim 7, for example, a switch provided with a contact on a free end side of a panel made of a magnetic conductive member senses heat from the auxiliary positive characteristic sensor and demagnetizes when the temperature reaches a set temperature. It is energized by the magnetic force of the warm magnet. That is, when the temperature is lower than the set temperature, the switch is attracted and turned on by the magnetic force of the thermosensitive magnet against the elastic force of the panel board, and when the temperature exceeds the set temperature, the switch is demagnetized by the elastic force of the panel board due to demagnetization of the thermosensitive magnet. Turn off at. When turning off, the magnetic force from the thermosensitive magnet decreases in inverse proportion to the square of the distance. The switch receives the strongest magnetic force when the contacts are on, and the magnetic force weakens rapidly after the contacts are separated, so the contacts can be disconnected quickly. Therefore, the arc does not continue and there is no rough contact or noise. The time for which connection is continued when the contact pressure is zero is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time.

According to claim 8, the lead switch is turned on and off by the magnetic force of the temperature-sensitive magnet which senses heat from the auxiliary positive-characteristic error sensor and demagnetizes when the temperature reaches the set temperature. That is, when the temperature is lower than the set temperature, the reed switch is turned on by the magnetic force of the temperature-sensitive magnet, and when the temperature exceeds the set temperature, the reed switch is turned off by the demagnetization of the temperature-sensitive magnet. When turning off, the magnetic force from the thermosensitive magnet decreases in inverse proportion to the square of the distance, so that the reed switch can cut the contact quickly. Therefore, the arc does not continue and there is no roughening of contacts and no noise. Connection time is short when the contact pressure is zero, and the contact does not open or close due to vibration. As a result, the connection reliability of the contact is high, and no failure occurs for a long time.

In claim 9, a through hole is formed at a predetermined position of a conductive plate having a panel portion for making electrical connection while holding the positive characteristic thermistor with a positive force, thereby reducing the width of the outer peripheral portion of the through hole. A fuse section is provided. As a result, the fuse of the fuse section blows when the current rises due to abnormal heat generation and thermal runaway in the positive temperature coefficient thermistor. For this reason, burning of the starting winding and the starting relay can be prevented.

According to the tenth aspect, a long hole is provided at an abutment angle portion of the panel portion that holds the positive characteristic thermometer, which is bent at an obtuse angle to make contact with the positive characteristic thermometer. As a result, the contact point with the positive-characteristic thermistor at the contact angle portion is split and doubled, thereby improving the contact reliability.

According to claim 11, a notch is provided at a contact angle portion of the panel portion holding the positive characteristic thermometer which is bent at an obtuse angle to make contact with the positive characteristic thermometer. As a result, the contact point between the contact angle portion and the positive characteristic error is divided, thereby doubling the contact point and improving the contact reliability. Furthermore, the resonance frequency of the contact angle portion differs between the inside and the outside of the notch. The vibration of the compressor is transmitted to the starting device, The positive characteristic thermistor spring member resonates, and if the positive characteristic thermistor electrode portion is hit with a panel member, the electrode is damaged or peeled off. In claim 11, the inner and outer sides of the contact angle portion resonate. Since the frequencies are different, they do not resonate at the same time, the abutment part does not hit the positive characteristic thermistor, and there is no damage to the positive characteristic thermistor electrode.

In order to achieve the above object, the invention according to claim 12 has a positive characteristic thermistor connected in series to the auxiliary winding, and a socket terminal for making an electrical connection between a detachable connection pin. In the starting device of the single-phase induction motor including the main winding and the auxiliary winding,

The socket terminal is configured such that a pair of plate portions extending laterally in the axial direction of the connection pin are bent inward, and the ends are formed in an arc shape so as to match the cylindrical shape of the connection pin, and the ends are separated from each other. Connection pin holding part,

The technical feature is that the connection pin holding portion is divided into a first portion on the tip side and a second portion on the back side by a slit in a direction perpendicular to the axial direction of the connection pin. In the starting device according to claim 12, since the connection pin holding portion of the socket terminal is divided into a first portion on the front end side and a second portion on the back side, when a prying force is applied when the connection pin is inserted. However, only the first portion on the tip side of the connection pin holding portion spreads, and the second portion on the back side does not spread. Therefore, in the second portion, no fatigue occurs, a good contact state with the connection pin can be maintained, and no damage due to heating of the contact portion occurs.

Further, at the time of insertion into the connection pin, first, the first portion on the tip side is expanded and inserted, and when the tip of the connection pin reaches the second portion on the back side, the second portion starts to spread. In other words, the force required at the time of insertion is the largest at the beginning and almost flat afterwards because it is necessary to push a part narrower than the connection pin, but in the present invention, when the insertion of the connection pin is started, it is divided. Since only the first part on the distal end side needs to be expanded, the insertion work becomes easier compared to the prior art product in which the entire connection pin holding portion had to be expanded. Also, because it is the same size as the prior art product, it has high space efficiency and can be easily applied to existing startup equipment.

In addition, even if there is an inclination between the connection pin and the socket terminal, the first portion on the distal end and the second portion on the back side independently contact the connection pin. Even if the socket terminal comes into point contact, the contact point is doubled, and the electrical connection between the connection pin and the socket terminal can be secured.

In claim 13, since the casing is provided with a concave portion for accommodating the distal end portion of the connection pin penetrating the connection pin holding portion, the chamfered portion of the distal end of the connection pin penetrates through the connection pin holding portion. It will be located in the recess. That is, since the chamfered portion is not gripped by the connection pin holding portion, the gripping force of the connection pin by the connection pin holding portion can be increased, and the contact resistance can be reduced.

According to claim 14, since the first portion on the distal end side of the connection pin holding portion is formed wider so as to hold the connection pin more gently than the second portion on the back side, it is necessary to start insertion of the connection pin. Power is small. On the other hand, the second portion on the far side is formed narrow, so that the second portion can maintain a good contact state with the connection pin, and the contact portion is not damaged by heating.

According to claim 15, since the length of the first portion on the distal end side of the connection pin holding portion in the axial direction of the connection pin is formed to be longer than the second portion on the back side, when the connection pin is inserted. The torsion force is received by the first portion, and the second portion can be prevented from being spread by the torsion. Thereby, a favorable contact state with the connection pin can be maintained at the second portion, and damage due to heating of the contact portion does not occur.

According to claim 16, since the length of the second portion on the back side of the connection pin holding portion in the axial direction of the connection pin is formed to be longer than the first portion on the front side, the second portion is strong at the second portion. By holding the connection pins at the same time, fatigue does not occur, good contact with the connection pins can be maintained, and damage due to heating of the contact portion does not occur.

According to claim 17, since a V-shaped cut is provided at the front end of the second portion on the back side of the connection pin holding portion, the first portion on the tip side is inserted through the connection pin when inserted into the connection pin. Even when the tip of the connection pin reaches the second part on the back side, it can be easily inserted into the second part side, and the insertion work becomes easier.

In order to solve the above-mentioned problem, the invention according to claim 19 is a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply, comprising: a casing;

An auxiliary PTC thermistor connected in parallel to the PTC thermistor; A slow-action bimetal that is connected in series to the series circuit of the auxiliary winding and the positive characteristic temperature sensor, detects heat from the auxiliary positive characteristic temperature sensor, and turns off when the temperature reaches a set temperature;

A closed chamber provided in the casing, for closing the slow-action bimetal and the auxiliary correction characteristics.

According to the starting device for a single-phase induction motor according to claim 19, when the single-phase induction motor is started, the positive-characteristic thermistor has a low resistance, so that the positive-characteristic thermistor and the slow-action bimetal are connected in series. The starting current flows through the auxiliary winding and starts the single-phase induction motor. When the start-up current flows, the PTC thermistor self-heats and becomes high resistance, and a large amount of current flows to the auxiliary PSC side connected in parallel with the PTC thermistor. When the temperature of the auxiliary positive-characteristic thermistor reaches the set temperature, the slow-action bimetal turns off, no current flows in the positive-characteristic thermistor, and the single-phase induction motor completes startup and enters steady operation.

When the slow action bimetal is turned off, current flows only to the auxiliary positive characteristic thermistor side and heat is generated, and the generated heat keeps the slow action bimetal off.

Therefore, during steady-state operation of the single-phase induction motor, no current flows in the positive characteristic temperature range, and instead, current flows to the auxiliary positive frequency range. The current that flows during one mis-operation is extremely small enough to generate heat to maintain the slow-action bimetal in the off-state during the auxiliary positive-characteristics error. The power consumption of the positive characteristic thermistor is extremely less than that of the evening.

In particular, the slow action bimetal and the auxiliary positive characteristic summit are housed in a closed room inside the casing, so it is difficult for heat to escape to the outside, and the slow action bimetal can be turned off with extremely low power consumption. Can be maintained. Furthermore, even if a flammable gas (a hydrocarbon compound such as butane) is used as the refrigerant for the hermetic compressor and the refrigerant leaks, it is housed in a hermetically sealed chamber, so that the slow-action bimetal can be opened and closed. Does not ignite due to sparks during operation. Furthermore, since the slow action bimetal is used, the formed snack is It can withstand long-term use compared to Yongby Metal.

In addition, during the steady-state operation of the single-phase induction motor, the start-up positive temperature characteristic heater with a large heat capacity is cooled to room temperature. On the other hand, in the case of the auxiliary positive characteristics, the cooling is quick because the heat capacity is small. Therefore, even when the single-phase induction motor is restarted immediately after it is stopped, the auxiliary positive temperature characteristic thermistor is immediately cooled down to near normal temperature, and the time required for restarting becomes very short, from several seconds to several tens of seconds. As a result, the overload relay can be restarted quickly without repeating the operation and return to operation as in the conventional technology.

In claim 20, the auxiliary positive characteristic thermistor is in contact with the base of the slow action bimetal. For this reason, heat from the auxiliary positive characteristic thermometer can be efficiently transmitted to the slow-action bimetal, and the slow action bimetal can be kept off in the auxiliary positive characteristic thermometer with low power consumption.

To achieve the above object, according to claim 21, in a starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

The auxiliary positive characteristic thermistor connected in parallel to the positive characteristic thermistor and the auxiliary winding and the series circuit of the positive characteristic thermistor connected in series to sense heat from the auxiliary positive characteristic thermistor and set. A slow-action bimetal that turns off when the temperature rises,

A snap-action bimetal which is connected in series to the series circuit of the auxiliary winding, the positive characteristic thermometer, and the slow action bimetal and senses heat from the positive characteristic thermometer and turns off when the temperature reaches a predetermined high temperature; It is a technical feature that it comprises.

According to the starting device for a single-phase induction motor of claim 21, when the single-phase induction motor is started, the positive-characteristic thermistor has a low resistance, so that the positive-characteristic thermistor and the slow-action bimetal are connected in series. The starting current flows through the auxiliary winding and starts the single-phase induction motor. When the start-up current flows, the positive characteristic thermistor self-heats and becomes high resistance, and a large current flows to the auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor. When the temperature of the auxiliary positive characteristic thermistor reaches the set temperature, the slow-action bimetal turns off, and no current flows in the positive characteristic thermistor. Therefore, the single-phase induction motor completes startup and enters steady operation.

When the slow-action bimetal is turned off, current flows only to the auxiliary positive characteristic thermistor side and heat is generated, and the generated heat keeps the slow-action bimetal off.

Therefore, during the normal operation of the single-phase induction motor, no current flows in the positive-characteristics summit, and instead, current flows to the auxiliary positive-characteristics summit side. The current flowing in the characteristic thermistor is extremely small enough to generate heat to maintain the slow-action bimetal in the off state in the auxiliary positive characteristic thermistor. Power consumption is extremely less than the power consumption in the evening. Furthermore, since the slow action bimetal is used, it can withstand long-term use as compared to the formed snap action bimetal.

In addition, when the temperature of the positive characteristic thermistor becomes abnormally high and reaches a predetermined high temperature, the snap action bimetal is turned off, and the current to the auxiliary winding is cut off. This prevents a situation in which a large current flows through the wire and dielectric breakdown occurs.

In claim 22, the snap action bimetal is set so as not to return at normal temperature. For this reason, thermal runaway in the positive characteristic thermistor due to the return of the snap action bimetal can be completely prevented.

In claim 23, the contact of the slow action bimetal and the contact of the snap action bimetal come into direct contact. When the temperature rises, it separates from the contact on the slow action bimetal side. When heat is applied and the slow action bimetal is turned off, heat is also applied to the snap action bimetal side and slightly moves away from the contact on the slow action bimetal side. Even if a slow slow-action bimetal is used, the starting current can be cut off properly. That is, as the temperature rises, the bimetals move away from each other, and chattering hardly occurs. Furthermore, since both contacts are composed of movable contacts, the wiping phenomenon (rubbing) always occurs due to temperature changes, and the contact contacts are cleaned. Thus, long life can be achieved by using silver contacts instead of gold plating. Furthermore, since the contact point of the slow-action bimetal and the contact point of the snap-action bimetal are in direct contact with each other, the contact point is lower than that of the case where a terminal member such as a metal plate having fixed contacts on both sides is interposed. Cost and low resistance can be realized.

In claim 24, a stopper is provided in contact with the tip of the snap-action bimetal so as not to hinder the operation of the slot action bimetal. For this reason, after the start-up is completed, the positive temperature characteristic thermistor cools, and even if the snap action bimetal returns to room temperature, it can be prevented from bending to the slow-action bimetal side, and an appropriate contact interval can be maintained. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 (A) is an explanatory view showing the mounting of the starting device and the over-opening relay according to the first embodiment to a compressor, and FIG. 1 (B) is a perspective view of a pin terminal.

FIG. 2 is a circuit diagram of the starting device and the overload relay according to the first embodiment.

FIG. 3 is a plan view of the overload relay according to the first embodiment.

FIGS. 4 (A) and 4 (B) are XX vertical sectional views of the overload relay shown in FIG. 3 with a cover attached thereto, and FIG. 4 (A) is a bimetallic cross-sectional view. The state before the inversion is shown, and FIG. 4 (B) shows the state after the inversion of the bimetal.

FIG. 5 (A) is a bottom view of the single-phase induction motor starting device according to the first embodiment of the present invention with the bottom cover removed, and FIG. 5 (B) is a bottom view of FIG. ) Shows a B1-B1 section, and FIG. 5 (C) shows a C1-C1 section of FIG. 5 (B). FIG. 6 (A) is a plan view of FIG. 5 (B) on the side of arrow e, FIG. 6 (B) is a side view of FIG. 5 (C) on the side of arrow f, FIG. 6 (C) is a bottom view of FIG. 5 (B) viewed from the arrow.

FIG. 7 (A) is a plan view showing a state in which the overload relay is assembled to the starting device, FIG. 7 (B) is a side view, and FIG. 7 (C) is a bottom view.

Fig. 8 (A) is a plan view of the snap action bimetal, and Figs. 8 (B) and 8 (C) are enlarged cross-sectional views of the starting device shown in Fig. 5 (C). It is. Fig. 9 (A) is an enlarged view of the first connection plate in Fig. 5 (A), Fig. 9 (B) is a view of Fig. 9 (A) from the arrow h, and Fig. 9 (C) is a view taken in the direction of arrow j in FIG. 9 (A), and FIG. 9 (D) is an enlarged perspective view of a contact portion with the main PTC surrounded by a circle D in FIG. 9 (C). It is.

FIG. 10 (A) is a plan view of a snap action bimetal according to a modification of the first embodiment, and FIGS. 10 (B) and 10 (C) are modifications of the first embodiment. It is sectional drawing which shows the starting device which concerns on an example.

FIG. 11 (A) is an enlarged view of a first connecting plate according to a modification of the first embodiment, and FIG. 11 (B) is a view taken in the direction of arrow h in FIG. 11 (A). Yes, Fig. 11 (C) is a view of arrow j in Fig. 11 (A), and Fig. 11 (D) is the main PTC surrounded by a circle D in Fig. 11 (C). FIG. 6 is an enlarged perspective view of a contact portion with the contact member.

FIG. 12 (A) is a plan view of a snap action bimetal of the activation device according to the second embodiment, and FIG. 12 (B) is a side view. FIG. 12 (C) is a plan view of a snap-action bimetal of a starting device of another example of the second embodiment, and FIG. 12 (D) is a side view of another example. FIG. 12 (E) and FIG. 12 (F) are explanatory diagrams of the operation of the snap action bimetal according to the second embodiment.

FIG. 13 (A) is a plan view of a snap-action bimetal of a starting device according to a modification of the second embodiment, and FIG. 13 (B) is a side view. FIGS. 13 (C) and 13 (D) are explanatory diagrams of the operation of the snap action bimetal according to the modification of the second embodiment.

FIGS. 14 (A) and 14 (B) are explanatory diagrams of the bimetal operation of the activation device according to the third embodiment.

FIGS. 15 (A) and 15 (B) are explanatory diagrams of the operation of the switch of the activation device according to the fourth embodiment.

FIG. 16 is an explanatory diagram of a reed switch of the activation device according to the fifth embodiment. 17 (A), 17 (B), and 17 (C) are circuit diagrams of an application example of the starter according to the present embodiment.

FIG. 18 (A) is an enlarged view of a portion surrounded by a circle E in FIG. 5 (B), and FIG. 18 (B) is a sectional view taken along line B 3—B 3 of FIG. 18 (A). Fig. 18 (C) is a cross-sectional view of C3-C3 in Fig. 18 (A) (a view of the front side cut from the center of the pin) FIG. 18 (D) is a perspective view of the socket terminal with the pin inserted.

FIG. 19 (A) is a plan view of the terminal shown in FIG. 18 (A), and FIG. 19 (B) is a cross-sectional view of FIG. 19 (A) taken along line B4-B4. Yes, FIG. 19 (C) is a view on arrow k in FIG. 19 (A).

FIG. 20 (A) is a plan view of the terminal according to the second embodiment, and FIG. 20 (B) is a cross-sectional view taken along B4-B4 of FIG. 20 (A). FIG. 20 (C) is a view on arrow k of FIG. 20 (A).

FIG. 21 (A) is a plan view of the terminal according to the third embodiment, and FIG. 21 (B) is a cross-sectional view taken along B4-B4 of FIG. 21 (A). FIG. 21 (C) is a view on arrow k of FIG. 20 (A).

FIG. 22 is a graph comparing the insertion input of the socket terminal of the first embodiment with that of the conventional socket terminal.

FIG. 23 (B) is a plan view of the activation device according to the sixth embodiment of the present invention in a state where a lid is removed, and FIG. 23 (A) is a plan view of A in FIG. 23 (B). — A section is shown, and FIG. 23 (C) shows a C-C section of FIG. 23 (B).

FIGS. 24 (A) and 24 (B) are side views of the activation device of the sixth embodiment.

FIG. 25 (B) is a plan view of the activation device according to the seventh embodiment with the lid removed, and FIG. 25 (A) is a cross-sectional view taken along line AA of FIG. 25 (B). FIG. 25 (C) shows a cross section C-C of FIG. 25 (B).

FIG. 26 is a circuit diagram of the activation device according to the seventh embodiment.

FIG. 27 (A) is a circuit diagram of a starting device according to the related art, and FIG. 27 (B) is a circuit diagram of a starting device according to JP-A-6-38467.

FIG. 28 (A) is a plan view of a conventional socket terminal, FIG. 28 (B) is a cross section, FIG. 28 (C) is a bottom view, and FIGS. FIG. 28 (E) is a cross-sectional view showing a state where the connection pin is inserted into the activation device. FIGS. 28 (F) and 28 (G) show the state where the connection pin is inserted into the socket terminal. It is a perspective view showing a state. BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment]

Hereinafter, an activation device and an overload relay according to a first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1 (A), the starting device 10 of the first embodiment and the over-opening drill 50 are integrally taken to the pin terminal 110 of the dome 104 of the compressor 102. And protected by a cover 106. A motor 100 is housed inside the compressor 102.

FIG. 2 is a circuit diagram of a single-phase induction motor starting device and an overload relay 50 according to the first embodiment. The power terminals 92 and 94 are connected to a 100 V single-phase AC power source 90, and one of the power terminals 92 is connected in series with an operation switch 97 and an overload relay 50. The power supply line 96 is connected, and the other power supply terminal 94 is connected to the power supply line 98. The overload relay 50 is composed of a bimetal 70 and a heater 76 for heating the bimetal 70, and when an overload is applied to the single-phase induction motor 100, the heat of the heater 76 is generated. As a result, the bimetal 70 cuts off the current, and when the temperature drops to room temperature due to the cutoff of the current, the bimetal 70 automatically returns to the normal state and restarts the energization.

The single-phase induction motor 100 has a main winding M and an auxiliary winding S. The main winding M is connected between the power supply lines 96 and 98, and one terminal of the auxiliary winding S is Connected to power line 96. The single-phase induction motor 100 drives, for example, the hermetic compressor 102 described above with reference to FIG. 1 of a refrigeration cycle in a refrigerator. The operation switch 97 is turned on and off by, for example, a temperature control device (not shown). The operation switch 97 turns on when the temperature in the refrigerator reaches the upper limit temperature, and turns off when the temperature in the refrigerator reaches the lower limit temperature. .

The other terminal of the auxiliary winding S is connected to a power supply line 98 through a series circuit of a positive characteristic thermistor (hereinafter referred to as a main PTC) 12 and a normally closed snap action bimetal 18. . An auxiliary positive characteristic thermistor (hereinafter referred to as an auxiliary PTC) 14 is connected in parallel with the main PTC 12 and the snap action bimetal 18. Here, the main PTC 12 and the auxiliary PTC 14 are made of, for example, an oxide semiconductor ceramic mainly composed of nordium thiocyanate and have a Curie temperature, and the electric resistance value is the Curie temperature. Rapidly increases from Have the property of Positive characteristic thermistors 12 are, for example, about 5Ω at room temperature (around 25 ° C), about 0.1kQ at 120, and about 1kΩ at 140 ° C; L0kΩ. The auxiliary PTC 14 has a higher resistance value than the main PTC 12, and has a heat capacity of 13 to 1/10 (optimally about 16) so that power consumption is 13 to 1/10. . The snap action bimetal 18 detects the heat generated by the auxiliary PTC 14 and turns on and off. When the detected heat reaches, for example, a set temperature of 140 ° C., the snap action bimetal 18 is turned off. .

Next, the operation of the activation device 10 of the first embodiment will be described. When the operation switch 97 is turned on, a starting current flows to the main winding M via the operation switch 97 and the overload relay 50. In addition, since the main PTC 12 has a low electric resistance value (for example, about 5 Ω) at room temperature, it can be used as a series circuit of the auxiliary winding S, the main PTC 12 and the snap-action bimetal 18, and a parallel circuit of the auxiliary PTC 14. Also, the starting current flows, so that the single-phase induction motor 100 starts.

When the starting current of the auxiliary winding S flows through the main PTC 12, the main PTC 12 and the auxiliary PTC 14 generate heat and the electric resistance value increases rapidly. After a few seconds, the main PTC 12 and the auxiliary PTC 14 reach a temperature of 140 ° C., and the electric resistance of the main PTC 12 at this time is, for example, l kQ to 10 kQ, and the snap action bimetal 1 The current flowing through 8 decreases. When the auxiliary PTC 14 reaches a temperature of 140 ° C, the snap action bimetal 18 senses this and turns off, so that no current flows through the series circuit of the main PTC 12 and the snap action bimetal 18, and Thus, the start of the single-phase induction motor 100 is completed, and the steady operation is performed.

When the snap action bimetal 18 is turned off, current flows only to the auxiliary PTC 14 side to generate heat, and the generated heat keeps the snap action bimetal 18 off.

Therefore, during the steady-state operation of the single-phase induction motor 100, no current flows through the main PTC 12, and instead, a force at which current flows to the auxiliary PTC 14 side. It is extremely small enough to generate heat to keep the snap bimetal 18 in the off state in the PTC 14, and the power consumption by the auxiliary PTC 14 is much smaller than that of the conventional PTC thermistor. Not much.

Also, during the steady-state operation of the single-phase induction motor 100, the main PTC 12 having a large heat capacity is cooled to room temperature. On the other hand, the auxiliary PTC 14 cools quickly because of its small heat capacity. Therefore, even when the single-phase induction motor 100 is restarted immediately after stopping, the auxiliary PTC 14 is immediately cooled to near normal temperature, and the time required for restart is several seconds to several tens of seconds. Very quickly, as in the prior art, the overload relay can be restarted quickly without repeating activation and return.

Subsequently, the mechanical structure of the overload relay 150 of the first embodiment will be described with reference to FIGS.

FIG. 3 is a plan view of the overload relay 50 with the cover removed, and FIG. 4 is a cross-sectional view taken along the line XX in FIG. 3 with a cover attached. As shown in FIG. 4, the overload relay 50 is composed of a base 52 made of unsaturated polyester and a cover 54 made of PBT resin, and the upper surface of the overload relay 50 extends from the motor side. A socket terminal 58 is provided for receiving a pin (not shown), and a tab terminal shown in FIG. 3 extends on the side surface and extends to the side to insert the power supply receptacle. 5 and 6 are arranged.

As shown in FIG. 4 (A), in the overload relay 50, the bimetal 70 is sandwiched between the movable contact plate 60 and the movable terminal 74, and the heat sink is located below the bimetal 70. 6 are provided. Above the bimetal 70, a movable contact plate 60 is provided. One end of the movable contact plate 60 is welded and fixed to the reinforcing plate 78, and a movable contact 62 that is in contact with the fixed contact 64 is attached to a free end. The mechanical configuration of the overload relay 50 will be described in more detail.

The tab terminal 56 connected to the power supply side receptacle is formed in a flat plate shape as shown in FIG. 3, and a connection plate 72 formed in a crank shape is spot-welded to the tab terminal 56. It is connected to the terminal 76 a of the heater 76 via the connection plate 72. The heat sink 76 is made of, for example, a nichrome or iron chrome wire wound in a coil shape and housed in a recess 52 c formed in the base 52 (see FIG. 4 (A)). As shown in FIG. 3, the other end 76 b of the heater 76 is connected to a reinforcing plate 78 via a movable terminal 74. As shown in FIG. 4 (A), the reinforcing plate 78 penetrates the hole of the movable contact plate 60 and the concave portion of the bimetal 70, and Welded to terminal 74.

The bimetal 70 includes a substantially rectangular snap portion 70a, and a pair of holding portions 70b and 7Ob for holding the snap portion 70a. It is formed (formed) in the same manner as a dish-shaped bimetal, and the curvature (concave / convex) is reversed at a predetermined temperature. As shown in FIG. 4 (A), the bimetal 70 is fixed by holding the holding portion 70 b between the movable contact plate 60 and the movable terminal 74. a is supported by a columnar supporting portion 52 a formed on the base 52. The heat generated in the heat sink 76 is efficiently transferred to the bimetal 7 by arranging the heat sink in a coil around the support portion 52 a and in the concave portion 52 c. It is made to tell 0.

The bimetal 70 is fixed by the holding portion 70b, and the snap portion 70a is supported by the support portion 52a, so that desired characteristics can be obtained only by assembly without adjustment. . In particular, since the holding portion 70b is smaller than the snap portion 70a, even if the holding portion 70b is fixed, the snap characteristics are the same as those of the conventional bimetal unit (unfixed bimetal). The required characteristics can be easily obtained. On the other hand, the movable contact plate 60 is made of an elastic metal plate, has a movable contact 62 at a free end, and has a convex portion 60a in contact with the free end 70a 'of the bimetal 70 at a substantially central portion. It is set up.

As shown in FIG. 4 (A), the movable contact point 62 of the movable contact plate 60 fixed to the reinforcing plate 78 contacts the fixed contact 64 and the fixed contact on which the fixed contact 64 is placed. As shown in FIG. 4 (A), the plate 66 has one end 66 a fixed to the base 52 side and the other end 66 b formed to a through hole or cutout formed in the cover 54. (Not shown) to the outside. The other end 66 b of the fixed contact plate and the socket terminal 58 are connected outside the cover 54.

As shown in FIG. 4 (B), a convex portion 54a is formed on the cover 54 of the overload relay 50 so that the movable contact plate 60 can swing upward. The cover 54 is formed with an engaging portion 55 for connecting to the activation device 10.

As shown in Fig. 4 (A), before the bimetal 70 reverses (snaps), the overload relay 50 is in contact with the movable contact 62 and the fixed contact 64. The current from the power supply input through the terminal 56 is supplied to the motor M side. Here, if an overcurrent flows due to overload or rotor constraint due to overloading of the motor M, the heat generated at the heater 76 will increase, and the bimetal 70 will reach a preset temperature (for example, 120 ° C). When it reaches, it snaps from a convex shape to a concave shape as shown in Fig. 4 (B) and pushes up the movable contact plate 60 to break the contact between the movable contact 62 and the fixed contact 64. As a result, power supply to motor M is stopped, and the motor is protected. When the power supply to the motor M is stopped, the current to the heater 76 is stopped, and the temperature of the bimetal 70 decreases. Then, when the temperature reaches a preset temperature, it snaps from a concave shape to a convex shape, and as shown in FIG. 4 (A), the contact between the movable contact 62 and the fixed contact 64 due to the nature of the movable contact plate 60. Power is restored, and power to M is resumed.

Subsequently, the mechanical structure of the activation device 10 of the first embodiment will be described with reference to FIGS.

FIG. 5 (A) is a bottom view of the starting device of the single-phase induction motor according to the first embodiment of the present invention in a state where a bottom cover is removed, and FIG. 5 (B) is a diagram illustrating a state where the bottom cover is attached. FIG. 5 (A) shows a B1-B1 cross section in the state, and FIG. 5 (C) shows a C1-C1 cross section of FIG. 5 (B). FIG. 5 (B) corresponds to the section B2-B2 in FIG. 5 (C). Fig. 6 (A) is a plan view on the side of arrow e in Fig. 5 (B), and Fig. 6 (B) is a side view of Fig. 5 (C) on the side of arrow f. FIG. 6 (C) is a bottom view of FIG. 5 (B) as viewed from the direction of arrow g. As shown in FIG. 6 (B), the starting device 10 includes a casing 40 and a bottom cover 46, and is formed with a flange 48 for externally attaching an over-opening / driller 50 shown in FIG. I have.

As shown in FIG. 5 (A), a terminal 22 connected to the auxiliary winding S shown in FIG. 2 is mounted inside the casing 40. The terminal 22 is formed by integrally forming a tab terminal 22C, a socket terminal 22A, and a connecting portion 22B for connecting these. A first connection plate 26 having a panel section 26B for holding the main PTC 12 is attached to the connection section 22B.

As shown in FIG. 5 (C), one end of the second connection plate 30 is connected to the tab terminal 22C of the terminal 22. The spring portion 30a at the other end of the second connection plate 30 applies and holds panel pressure to the auxiliary PT C14. Auxiliary PTC 14 snap action Contacting the base of Bimetal 18. That is, the spring portion 30 a of the second connection plate 30, the auxiliary PTC 14, the base of the snap-action bimetal 18 and one end of the third connection plate 32 are connected adjacently. The other end of the third connection plate 32 is connected to a tab terminal 24 C of a terminal 24 for connecting to the power supply line 98 and the main winding M shown in FIG. The terminal 24 has a tab terminal 24 C and a socket terminal 24 A. On the other hand, a movable contact 18a is provided on the tip side of the snap action bimetal 18 and is in contact with the fixed contact 36a of the fixed contact plate 36 formed in a crank shape. A stopper 49 for restricting the movement of the movable contact 18a is provided on the side wall of the casing 40 of the movable contact 18a. On the other hand, the other end of the fixed contact plate 36 is connected to the fourth connection plate 33, and the other end of the fourth connection plate 33 is a terminal 25 having a tab terminal 25C and a socket terminal 25A. It is connected to the. To the terminal 25, a fifth connection plate 34 including a panel portion 34B for holding the main PTC 12 is attached. The fifth connection plate 34 is the same member as the first connection plate 26.

Here, the snap action bimetal 18 and the auxiliary PTC 14 are housed in a closed chamber 44 formed by a partition wall 42 provided inside the casing 40. The closed chamber 4 4 has an airtight structure. The second connecting plate 30 is provided through a through hole 42 a provided in the casing 40 side wall, the third connecting plate 32 is provided through a through hole 42 b, and the fourth connecting plate 33 is provided through a through hole 42 b. It is routed into the closed chamber 44 through the through hole 42c. FIG. 7 (A) is a plan view showing a state where the over-opening relay 50 is assembled to the starting device 10, FIG. 7 (B) is a side view, and FIG. 7 (C) is a bottom view. It is a figure. The assembling is performed by engaging the engaging portion 55 of the overload relay 50 with the flange 48 of the activation device 10.

In the starter 10 of the first embodiment, the snap action bimetal 18 and the auxiliary PTC 14 are housed in the closed chamber 44 in the casing 40, so that heat is hardly escaping to the outside, and extremely low power consumption The snap action bi-mail 18 can be kept off. In addition, even if a flammable gas (a hydrocarbon compound such as butane) is used as a refrigerant for the hermetic compressor and the refrigerant leaks, it is stored in the closed chamber 44 because of the snap action It does not ignite due to sparks during opening and closing operation of Bimetal 18.

In addition, the auxiliary PTC 14 is directly connected to the base of the snap action bimetal 18 The heat from the auxiliary PTC 14 can be efficiently transferred to the snap bimetal 18, and the low power consumption auxiliary PTC 14 can keep the snap bimetal 18 off. it can.

The snap-action bimetal 18 of the activation device 10 of the first embodiment will be described in more detail with reference to FIG.

FIG. 8 (A) is a plan view of the snap action bimetal 18, and FIGS. 8 (B) and 8 (C) are enlarged cross sections of the starting device shown in FIG. 5 (C). FIG.

The snap action bimetal 18 has a substantially rectangular opening formed in the center, and has a movable contact plate 18b that swings the movable contact 18a, a bimetal 18c, and a first movable contact plate 18b. It consists of a panel panel 18d with a semicircular cross section interposed between the support point P1 and the second support point P2 of the bimetal 18c. The tip of the movable contact plate 18b is bifurcated to hold two movable contacts 18a.

Here, the plate panel 18d is made of a spring material or bimetal, and is attached so as to bias the movable contact plate 18b. That is, as shown in FIG. 8 (B), the second support point P2 is lower in temperature than the line connecting the fulcrum P3 of the movable contact plate 18b and the first support point P1 to the lower temperature of the bimetal 18c. When it is near the leading end position, the panel panel 18d urges the movable contact plate so that the movable contact 18a presses the movable contact 18a against the fixed contact 36a. For this reason, even before the snap action bimetal 18 is disconnected, the contact time between the movable contact 18a and the fixed contact 36a is short while the contact pressure is zero, and the movable contact 1 8a and fixed contact 36a do not open or close.

On the other hand, as shown in FIG. 8 (C), the second support point P2 is higher than the line connecting the fulcrum P3 of the movable contact plate 18b and the first support point P1 when the temperature of the bimetal 18c is high. When it is closer to the tip position side, the movable panel 18b is urged so that the panel 18d separates the movable contact 18a from the fixed contact 36a. That is, from the state shown in FIG. 8 (B), the bimetal 18c curves upward, and the second support point P2 forces the fulcrum P3 of the movable contact plate 18b and the first support point P1. When it comes to the upper side beyond the connecting line segment (dead point), the biasing direction of the panel panel 18d is reversed, and the snap action bimetal 18 becomes the movable contact 18 as shown in Fig. 8 (C). Disconnect a from fixed contact 3 6 a You. This allows the contacts to be cut quickly. Therefore, the arc does not continue and there is no roughening of contacts and no noise. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time.

The configuration of the first connection plate 26 will be described in more detail with reference to FIG. FIG. 9 (A) is an enlarged view of the first connection plate 26 in FIG. 5 (A), and FIG. 9 (B) is a view of FIG. Fig. (C) is a view taken in the direction of arrow j in Fig. 9 (A), and Fig. 9 (D) is an enlarged perspective view of the contact portion with the main PTC surrounded by a circle D in Fig. 9 (C). FIG. As described above, the fifth connection plate 34 is the same member as the first connection plate 26.

The first connection plate 26 is made of a conductive spring material such as stainless steel coated with copper or a copper alloy or a conductive metal material. The first connecting plate 26 has a connecting portion 26A bent in a crank shape as shown in FIG. 9 (A) and a right angle to the bending direction of the connecting portion 26A as shown in FIG. 9 (B). It comprises a pair of spring portions 26B, 26B bent in a U-shape in each direction. The panel sections 26B and 26B hold the main PTC 12 elastically and make electrical connections. As shown in FIG. 9 (C), the spring portions 26B, 26B are formed by providing a rectangular opening at the center of a pair of rectangular plates extending laterally to form a pair of parallel portions 26c. , 26c, and a connecting portion 26d connecting the parallel portions 26c, 26c to form a pair of U-shaped portions facing each other, and the pair of U-shaped portions are respectively inwardly directed in cross section. It is bent in a U-shape. In the vicinity of the tip of the parallel portion 26c, a contact angle portion 26f that contacts the main PCT 12 is formed by bending and projecting so that the connection portion 26d is on the inside. As shown in FIG. 9 (B), the parallel portions 26c, 26c are provided with a constricted portion 26e for reducing the contact area with the casing 40 and preventing heat conduction. A through hole 26h is formed in the bent portion of the connection portion 26A on the spring portion 26B side. That is, in the first connection plate 26, the width of the outer peripheral portion (fuse portion) 26j of the through hole 26h is set to 0.5 mm or less. When the current of the start winding S flows for a certain time (for example, 30 seconds) or more, the fuse 26j on the outer periphery of the through hole 26h blows. As a result, if the main PCT 12 is deteriorated and becomes abnormally heated or overruns and becomes almost short-circuited, the fuse portion 26 j is blown by the current, thereby preventing the starting winding S and the starting device itself from burning. . In particular, 26 h through hole in the bend By forming the bent portion, the bent portion can be provided with an elastic force, and by maintaining the state where the elastic force is provided, it is possible to prevent re-welding of the blown portion when the fuse portion 26 j is blown. Can be.

Further, as shown in FIG. 9 (D), a contact hole 26 f bent at an obtuse angle to make contact with the main PCT 12 of the parallel portion 26 c has an elongated hole 26 g. It is provided parallel to the extending direction of the parallel portion 26c. As a result, the contact point of the contact angle part 26 f with the main PCT 12 is divided and doubled, and the entire panel part 26 B becomes the contact angle part 26 4 of four force places. And come into contact with the main PCT 12 at 8 places. Thereby, the contact reliability can be improved.

Subsequently, the structure of the terminal 22 of the activation device 10 will be described with reference to FIGS. 18 and 19.

Fig. 18 (Α) is an enlarged view of the part surrounded by a circle 図 in Fig. 5 (Β), and Fig. 18 (Β) is Β 3-の of Fig. 18 (Α). Fig. 18 (C) is a sectional view taken along the line C3-C3 of Fig. 18 (Α) (a view cut from the center of the pin and the near side). Fig. 18 (D) ) Is a perspective view of the socket terminal 22 # with the pins 116 inserted. FIG. 19 (A) is a plan view of the terminal 22 shown in FIG. 18 (A), and FIG. 19 (B) is a cross section taken along line B 4—B 4 of FIG. 19 (A). FIG. 19 (C) is a view taken in the direction of arrow k in FIG. 19 (A).

The terminal 22 is made of a conductive spring material such as stainless steel plated with copper, a copper alloy, or a conductive metal material, like the first connection plate 26. As shown in FIG. 19 (A), the terminal 22 is formed by integrally forming a tab terminal 22C, a socket terminal 22A, and a connecting portion 22B for connecting these. The tab terminal 22C is formed by folding a pair of plate portions 22k, 22k extending inward in the axial direction of the connection pins inward to form a two-layer structure as shown in Fig. 19 (B). The structure is strong. Tab terminal 2 2 C through the center? L2 2 1 has been drilled. The connecting portion 22B is formed in a substantially crank shape, and a through hole 22m is formed in the center.

As shown in Fig. 19 (C), the socket terminal 22A is formed by bending a pair of plate portions 22d, 22d extending inward in the axial direction of the connection pin inward, and bending the tip end of the connection pin. It is formed in an arc shape so as to be able to conform to the cylindrical shape of the above, and is provided with a connection pin holding portion 22 e having the tips separated from each other. Fig. 19 (A) As shown in (1), the connection pin is divided into a first portion 22g on the distal end side and a second portion 22h on the back side by a slit 22f in the axial direction and the vertical direction of the connection pin. On the opposite side (lower side in FIG. 19 (C)) of the connection pin holding portion 22 e, a V-shaped groove 22 n is formed to make good contact with the connection pin. A V-shaped notch 2 2j is formed at the tip of the first portion 22g, and a V-shaped notch 220 is formed at the tip of the V-shaped groove 22n. Have been.

As shown in Fig. 18 (A), Fig. 18 (B), and Fig. 18 (C), the casing 40 that holds the terminal 22 has a connection that penetrates the connection pin holding portion 22 e. A concave portion 40a for accommodating the tip portion 116a of the pin 116 is formed.

In FIGS. 18 and 19, the socket terminal 22 A of the terminal 22 has been described, but the socket terminal 24 A of the terminal 24 and the socket terminal 58 of the overload relay 50 are also described. Similarly, it has a two-part structure. The starting device 10 of the first embodiment has the overload relay 50 attached thereto as described above with reference to FIG. 7, and has the compressor 102 as described above with reference to FIG. Attached to pin 110. FIG. 1 (B) shows a perspective view of the pin terminal 110. Pin Terminal 110 has three connecting pins 1 1 2, 1 114, and 1 16 standing up. Socket pin 58 is connected to connecting pin 112 and socket is connected to connecting pin 114. Terminal 24 A is connected to socket pin 22 A to connection pin 1 16.

In the activation device 10 and the overload relay 50 of the first embodiment, the connection pin holding portions 2 2 e of the socket terminals 22 A, 24 A, 58 are connected to the first portion 22 g on the distal end side. And the second part 2 2h on the back side, so that as shown in Fig. 18 (D), when the connecting pin 1 16 was inserted, a twisting force was exerted in the X direction and Z or Y direction. Even in this case, only the first portion 22 g on the tip side of the connection pin holding portion 22 e spreads, and the second portion 22 h on the far side does not spread. Therefore, in the second portion 22 h, no fatigue occurs, a good contact state with the connection pin can be maintained, and no damage is caused by heating of the contact portion.

Fig. 22 shows the required insertion force when connecting pins are inserted. In the figure, the vertical axis represents the 揷 input, and the horizontal axis represents the pin insertion stroke. The chain line indicates the input when the connection pin 212 is inserted into the socket terminal 122 A of the conventional technique described above with reference to FIG. The solid line indicates that the connection pin 1 16 is inserted into the socket terminal 22 A according to the first embodiment. Input when inputting. When starting insertion of the connection pin 2 12, the socket terminal 1 2 A of the prior art shown in FIG. 28 (F) is used to hold the connection pin holding section (plate section 1 2 2 d, 1 2 2 d Is bent inward, and the tip is formed in an arc shape so that it can match the cylindrical shape of the connection pin). For this reason, the insertion force is very large at the beginning and becomes constant thereafter.

On the other hand, when the socket terminal 22A of the first embodiment is inserted into the connection pin, first, the first portion 22g on the distal end side expands. Compared to the part 122 e, the first part 22 g, which is half the length of the first part 22 g, only needs to be expanded in the axial direction. When the tip of the connecting pin 1 16 reaches the second part 22 h on the far side (P 2 in the figure), the second part 22 h starts to spread, but the connection of the socket terminal 1 2 A of the conventional technology Compared with the pin holding part 1 2 2 e, the second part 22 h, which is half the length in the axial direction, can be pushed and spread, so a large force is not required. ^ The first part 22 g No extra force is required because the applied force acts to insert the connection pins 1 16 vertically. As described above, in the socket terminal 22A of the first embodiment, at the time of starting the insertion of the connection pin, only the divided first portion 22g of the distal end side needs to be expanded, so that the entire connection pin holding portion needs to be expanded. Insertion work becomes easier compared to the prior art products that had a problem.

Further, since the socket terminal 22A of the first embodiment is the same size as the prior art product, it has high space efficiency and can be easily applied to an existing starting device.

Also, even if there is an inclination between the connection pin 1 16 and the socket terminal 22 A, the first portion 22 g on the distal end and the second portion 22 h on the back side are independently connected to each other. Because it makes contact with 16, even if the contact pin 1 16 comes into point contact with the socket terminal 22 A, the contact point is doubled and the electrical connection between the connection pin and socket terminal is established. Can be maintained.

Further, as described above with reference to FIG. 18 (A), in the starting device 10 of the first embodiment, the distal end portion 1 16a of the connection pin 1 16 penetrating the connection pin holding portion 2 2e Since the recess 40a for accommodating the connection pin is provided in the casing 40, the chamfered tip 1 16a of the tip of the connection pin 116 passes through the connection pin holding portion 22e. It will be located in the recess 40a. In the prior art shown in FIGS. 28 (D) and 28 (E), the chamfered tip 2 1 2a is inside the connection pin holding section 1 2 e. As a result, the distal end portion 212a could not be gripped, and the gripping force of the connection pin holding portion 122e was reduced. On the other hand, in the starting device of the first embodiment, since the distal end portion 1 16a of the chamfered connection pin 1 16 is not gripped by the connection pin holding portion 2 2 e, the connection pin holding portion 2 2 e The gripping force of the connection pin 1 16 can be increased. In particular, in the first embodiment, the gripping force is reduced by the width of the slit 22 f shown in FIG. 21A, but by providing the concave portion 40 a, the same length as that of the conventional technology having no slit is provided. It is possible to obtain a gripping force equivalent to that of the connection pin holding portion 1 2 2e of FIG.

As shown in FIG. 19 (B), the socket terminal 2A of the first embodiment has a diameter Φ1 of a first portion 22g on the distal end side of the connection pin holding portion 22e, and a second inner portion It is set slightly larger than 2 2 h diameter 2. That is, since the first portion 22 g on the tip side of the connection pin holding portion 22 e is formed wider so as to hold the connection pin 116 more loosely than the second portion 22 h on the back side, Less force is required at the start of connecting pin insertion. On the other hand, since the rear second portion 22h is formed to be narrow, the second portion 22 can maintain a good contact state with the connection pin 116, and damage due to heating of the contact portion can be prevented. Does not occur.

[Modification of First Embodiment]

A starting device according to a modification of the first embodiment will be described with reference to FIG. 10 and FIG. FIG. 10 (A) is a plan view of a snap-action bimetal according to a modification of the first embodiment, and FIG. 10 (B) is a snap of a starting device according to a modification of the first embodiment. FIG. 10 is a cross-sectional view showing an on state of the action bimetal 18, and FIG. 10 (C) is a cross-sectional view showing an off state. .

As shown in FIG. 10 (A), in a modification of the first embodiment, the snap-action bimetal 18 is made of a single bimetal, has an opening at the center, and has a movable contact 18a. The contact panel 18 e and the bimetal portion 18 f provided at the center of the opening are provided. As in the first embodiment, the plate panel 18 d is connected to the first support point P of the movable contact plate 18 e. It is arranged so as to be interposed between 1 and the second support point P2 of the bimetal portion 18f. As shown in FIGS. 10 (B) and 10 (C), the operation of the snap action bimetal 18 is the same as that described with reference to FIGS. 8 (B) and 8 (C). The description is omitted because it is similar to the first embodiment. FIG. 11 shows a first connection plate 26 according to a modification of the first embodiment. FIG. 11 (A) is an enlarged view of the first connection plate 26, FIG. 11 (B) is a view taken on arrow h of FIG. 11 (A), and FIG. 11 (C) is a view of FIG. 11 (A) is a view taken in the direction of the arrow j. FIG. 11 (D) is an enlarged perspective view of a contact portion with a main PTC surrounded by a circle D in FIG. 11 (C). .

The first connection plate 26 according to the modification of the first embodiment is the same as the first connection plate of the first embodiment described above with reference to FIG. However, in the first embodiment, the elongated hole 26 g is provided in the contact angle portion 26 f in parallel with the extending direction of the parallel portion 26 c. On the other hand, in the modification of the first embodiment, as shown in FIG. 11 (D), a notch 26m is provided in the contact corner 26f in parallel with the extending direction of the parallel portion 26c. It has been done.

In a modification of the first embodiment, a notch 26m is provided at a contact angle portion 26f of the panel portion 26B holding the main PCT 12 that is bent at an obtuse angle so as to make contact with the main PCT 12. As a result, the contact point of the contact angle portion 26 f with the main PCT 12 is divided, thereby doubling the contact point, thereby improving the contact reliability. Further, the resonance frequency of the contact angle portion 26f differs between the inside and the outside of the notch 26m. The vibration of the compressor is transmitted to the starter 10, and the main PCT 12 and the panel section 26B resonate.If the main PCT 12 electrode section is hit with the panel section 26B, the electrodes are damaged or peeled off. Since the resonance frequency is different between the inside and outside of the contact angle portion 26f, no resonance occurs at the same time, and the contact angle portion 26f does not hit the main PCT 12, thereby damaging the electrodes of the main PCT 12. Does not occur.

[Second embodiment]

The snap action bimetal 18 of the activation device according to the second embodiment will be described with reference to FIG.

FIG. 12 (A) is a plan view of the snap action bimetal 18 of the activation device of the second embodiment, and FIG. 12 (B) is a side view. FIG. 12 (C) is a plan view of a snap action bimetal 18 of another example of the activation device of the second embodiment, and FIG. 12 (D) is a side view of another example. FIG. 12 (E) is an explanatory diagram of the on state of the snap action bimetal 18 of the second embodiment, and FIG. 12 (F) is an explanatory diagram of the off state. As shown in Fig. 12 (A), the snap action bimetal 18 has an elongated hole near the center of the plate-shaped bimetal, and the central portion 18 h sandwiched between the elongated holes has no added Each side of the slot has 18 g of drawing at two places. Fig. 12 (C) and Fig. 12 (D) are other examples in which 18 g of drawing was performed at one point. As shown in FIGS. 12 (E) and 12 (F), the snap action bimetal 18 can realize a snap action by drawing. In the activation device of the second embodiment, the snap action bimetal 18 is made of the bimetal that has been subjected to the drawing 18 h, so that the contact can be quickly cut. Therefore, the arc does not continue and there is no rough contact or noise. The connection is kept for a short time when the contact pressure is zero, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time. Subsequently, the structure of the terminal 22 of the activation device 10 according to the second embodiment will be described with reference to FIG.

FIG. 20 (A) is a plan view of a terminal 22 of the activation device according to the second embodiment, and FIG. 20 (B) is a cross section taken along line B4-B4 of FIG. 20 (A). FIG. 20 (C) is a view on arrow k in FIG. 20 (A).

The activation device of the second embodiment is the same as the first embodiment described above with reference to FIGS. 5 and 6. However, in the first embodiment, the length in the connection pin axial direction between the first portion 22 g on the distal end side of the connection pin holding portion 22 e of the socket terminal 22 A and the second portion 22 h on the back side of the socket terminal 22 a It was equal. On the other hand, in the second embodiment, the length of the first portion 22 g on the distal end side of the connection pin holding portion 22 e in the connection pin axial direction is longer than the rear second portion 22 h. Is formed. For this reason, it is possible to receive the twist at the time of insertion of the connection pin at the first portion 22 g and prevent the second portion 22 h from being spread due to the twist. As a result, a favorable contact state with the connection pin 116 can be maintained at the second portion 22 h, and damage due to heating of the contact portion does not occur.

[Modification of Second Embodiment]

A snap action bimetal 18 of the activation device according to the modification of the second embodiment will be described with reference to FIG.

FIG. 13 (A) is a plan view of a snap-action bimetal 18 of a starter according to a modification of the second embodiment, and FIG. 13 (B) is a side view. Thirteenth FIG. (C) is an explanatory diagram of an ON state of a snap action bimetal 18 according to a modification of the second embodiment, and FIG. 13 (D) is an explanatory diagram of an OFF state. As shown in Fig. 13 (A), the snap action bimetal 18 has a flat bimetal with a light forming 18i at the center. As shown in FIGS. 13 (C) and 13 (D), the snap action bimetal 18 can realize a snap action by forming.

In the activation device according to the modification of the second embodiment, the snap action bimetal 18 is made of a bimetal that has been subjected to the forming process 18i, so that the contact can be quickly cut. Therefore, the arc does not continue and there is no rough contact or noise. The time to continue connection when the contact pressure is zero is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high and no failure occurs for a long time.

[Third embodiment]

The bimetal 18 of the activation device according to the third embodiment will be described with reference to FIG.

FIG. 14 (A) is an explanatory diagram of the on-state of the bimetal 18 of the third embodiment, and FIG. 14 (B) is an explanatory diagram of the off-state of the bimetal 18.

The bimetal 18 of the third embodiment has an auxiliary PTC disposed on the base and a movable contact 18a on the free end side, similarly to the first and second embodiments. Further, a magnet 23 A that applies a magnetic force to bias the movable contact 18 a toward the fixed contact 36 a with respect to the bimetal 18 is provided near the bimetal 18. Other configurations are the same as those of the first embodiment described above with reference to FIGS. 1 to 9, and thus description thereof is omitted.

In the starting device according to the third embodiment, the bimetal 18 having the movable contact 18a on the free end side is urged toward the contact on side by the magnetic force of the magnet 23A. When bimetal 18 turns off, the magnetic force from magnet 23 A decreases in inverse proportion to the square of the distance. The bimetal 18 receives the strongest magnetic force when the movable contact 18a is on as shown in FIG. 14 (A), and the movable contact 18a separates as shown in FIG. 14 (B). After that, the magnetic force suddenly weakens, so the movable contact 18a can be quickly disconnected from the fixed contact 36a. Therefore, the arc does not continue and there is no rough contact or noise. Contact pressure When the connection is continued when the value is zero, the contact time is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs over a long period of time.

Subsequently, the structure of the terminal 22 of the activation device 10 according to the third embodiment will be described with reference to FIG.

FIG. 21 (A) is a plan view of a terminal 22 of the activation device according to the third embodiment, and FIG. 21 (B) is a cross section taken along line B 4-B 4 of FIG. 21 (A). FIG. 21 (C) is a view taken in the direction of arrow k in FIG. 21 (A).

The activation device of the third embodiment is the same as that of the first embodiment described above with reference to FIGS. 5 and 6. However, in the first embodiment, the length in the connection pin axial direction between the first portion 22 g on the distal end side of the connection pin holding portion 22 e of the socket terminal 22 A and the second portion 22 h on the back side of the socket terminal 22 a is not limited. It was equal. In contrast, in the third embodiment, the length of the second portion 22 h on the back side of the connection pin holding portion 22 e in the connection pin axial direction is longer than the length of the first portion 22 g on the near side. Is formed. Therefore, by firmly holding the connection pin 116 at the second part 22 h, no fatigue occurs, and a good contact state with the connection pin 116 can be maintained. There is no damage caused by heating.

In the third embodiment, a V-shaped notch 22p is provided at the front end of the second portion 22h on the back side of the connection pin holding portion 22e. For this reason, at the time of insertion into the connection pin 1 16, even when the end of the connection pin 1 16 through which the first portion 22 g on the distal end has passed reaches the second portion 22 h on the back side, the second It can be easily inserted into the site 22h side, making the insertion work easier.

[Fourth embodiment]

The switch 18 of the activation device according to the fourth embodiment will be described with reference to FIG. FIG. 15 (A) is an explanatory diagram of the ON state of the switch 18 of the fourth embodiment, and FIG. 15 (B) is an explanatory diagram of the OFF state of the switch 18.

The switch 18 of the fourth embodiment is made of a magnetic conductive member, and has a movable contact 18a provided on the free end side. A temperature-sensitive magnet 23 B for applying a magnetic force to the switch 18 to urge the movable contact 18 a toward the fixed contact 36 a is provided directly above the switch 18. Auxiliary PTC is provided adjacent. Other configurations are the same as those of the first embodiment described above with reference to FIGS. I do.

In the starting device according to the fourth embodiment, a switch 18 having a movable contact 18a on the free end side of a panel made of a magnetic conductive member senses heat from the auxiliary PTC, and the temperature reaches a set temperature. Then, it is energized by the magnetic force of the thermosensitive magnet 23 B, which is demagnetized. That is, as shown in FIG. 15 (A), when the temperature is lower than the set temperature, the switch 18 is attracted and turned on by the magnetic force of the thermosensitive magnet 23B against the elastic force of the panel board. On the other hand, when the temperature becomes equal to or higher than the set temperature as shown in FIG. 15 (B), the switch 18 is turned off by the force of the spring plate due to the demagnetization of the thermosensitive magnet 23B. When turning off, the magnetic force from the thermosensitive magnet 23 B decreases in inverse proportion to the square of the distance. The switch 18 receives the strongest magnetic force when the contact is on, and the magnetic force decreases rapidly after the movable contact 18a is separated, so that the movable contact 18a can be quickly disconnected from the fixed contact 36a. Therefore, the arc does not continue and there is no rough contact or noise. The time for which connection is continued when the contact pressure is zero is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time.

[Fifth Embodiment]

The reed switch 19 of the activation device according to the fifth embodiment will be described with reference to FIG.

In the fourth embodiment, the switch 18 made of a magnetic conductive member is used, but in the fifth embodiment, a lead switch 19 is used instead of the switch. A temperature-sensitive magnet 23 B for applying a magnetic force to the reed switch 19 to urge the contact ON side is provided immediately above the lead switch 19, and an auxiliary PTC is provided adjacent to the temperature-sensitive magnet 23 B. 16 are provided. Other configurations are the same as those in the first embodiment described above with reference to FIGS. 1 to 9, and thus description thereof is omitted.

In the starter of the fifth embodiment, the reed switch 19 is turned on and off by the magnetic force of the thermosensitive magnet 23B which senses heat from the auxiliary PTC 16 and demagnetizes when the temperature reaches a set temperature. That is, when the temperature is lower than the set temperature, the reed switch 19 is turned on by the magnetic force of the temperature-sensitive magnet 23B, and when the temperature exceeds the set temperature, the reed switch 19 is turned off by the demagnetization of the temperature-sensitive magnet 23B. When turning off, the magnetic force from the thermosensitive magnet 23B decreases in inverse proportion to the square of the distance, so that the reed switch 19 can quickly cut the contact point. Therefore, the arc does not continue, causing rough contacts and noise. There is no life. The time to continue connection when the contact pressure is zero is short, and the contact does not open or close due to vibration. As a result, the connection reliability of the contacts is high, and no failure occurs for a long time.

FIG. 17 shows a circuit in which the starting device 10 of the present embodiment is used. In addition to the circuit not using a capacitor described above with reference to FIG. 2, when the running capacitor C1 is connected in parallel to the starting device 10 as shown in FIG. When the starting capacitor C2 is connected in series with the starting device 10 as shown in Fig. 17 (B), the running capacitor C is connected in parallel with the starting device 10 as shown in Fig. 17 (C). The starting device 10 of the present embodiment can also be used preferably when the starting capacitor C2 is connected in series with the starting capacitor C1.

[Sixth embodiment]

Since the configuration of the sixth embodiment is the same as that of the first embodiment, a description thereof will be omitted with reference to FIGS. 1 to 7. In the first embodiment, the snapshot bimetal 18 is used, but in the sixth embodiment, the slow action bimetal 18 is used.

The operation of the activation device 10 according to the sixth embodiment will be described. When the operation switch 97 is turned on, a start-up current flows to the main winding M via the operation switch 97 and the over-opening 50. Also, since the main PTC 12 has a low electrical resistance value (for example, about 5 Ω) at room temperature, the auxiliary winding S, the series circuit of the main PTC 12 and the slow action bimetal 18, and the parallel connection of the auxiliary PTC 14 A starting current also flows through the circuit, and the single-phase induction motor 100 starts.

When the starting current of the auxiliary winding S flows through the main PTC 12, the main PTC 12 and the auxiliary PTC 14 self-heat and the electric resistance value increases rapidly. After a few seconds, the main PTC 12 and the auxiliary PTC 14 reach a temperature of 140 ° C., and the electric resistance of the main PTC 12 at this time becomes, for example, 1 kQ to 10 The current flowing through action bimetal 18 decreases. When the temperature of the auxiliary PTC 14 reaches a temperature of 140 ° C, the slow-action bimetal 18 detects this and turns off, and the series circuit of the main PTC 12 and the slow-action bimetal 18 The current stops flowing, and thus the start of the single-phase induction motor 100 is completed, and the steady-state operation starts. When the slow action bimetal 18 is turned off, current flows only to the auxiliary PTC 14 side to generate heat, and the generated heat keeps the slow action bimetal 18 off.

Therefore, during the steady operation of the single-phase induction motor 100, no current flows through the main PTC 12, and instead, current flows through the auxiliary PTC 14, but the current flowing through the auxiliary PTC 14 is The power consumption of the auxiliary PTC 14 is extremely small enough to generate heat for holding the switch bimetal 18 in the off state. Very few. Furthermore, since the slow action bimetal is used, it can withstand long-term use as compared to the formed snap action bimetal. Also, during the steady-state operation of the single-phase induction motor 100, the main PTC 12 having a large heat capacity is cooled to room temperature. On the other hand, the auxiliary PTC 14 has a small heat capacity, so it cools quickly. Therefore, even when the single-phase induction motor 100 is restarted immediately after stopping, the auxiliary PTC 14 is immediately cooled down to near room temperature, and the time required for restarting is very short, from several seconds to several tens of seconds. However, unlike the prior art, the overload relay can be restarted quickly without repeating the operation and return. In addition, since the heat capacity of the auxiliary PTC 14 is set small, the restart time can be shortened.

Next, the mechanical structure of the activation device 10 according to the sixth embodiment will be described with reference to FIGS. 23 and 24.

FIG. 23 (B) is a plan view of the single-phase induction motor starting device according to the sixth embodiment of the present invention with the lid removed, and FIG. 23 (A) is a plan view of FIG. 23 (B). FIG. 23 (C) shows an A-A section of FIG. 23, and FIG. 23 (C) shows a C-C section of FIG. 23 (B). FIG. 24 (A) is a side view of FIG. 23 (B) on the side of arrow e, and FIG. 24 (B) is a side view of FIG. 23 (B) on the side of arrow d. As shown in FIG. 24 (B), the starting device 10 includes a casing 40 and a lid 46, and is formed with a flange 48 for attaching an overload relay 50 to the outside.

As shown in FIG. 23 (C), a terminal 22 connected to the auxiliary winding S is mounted inside the casing 40. The terminal 22 is formed by integrally forming a tab terminal 22a, a pin terminal 22c, and a connecting portion 22b for connecting these. The A first connecting plate 26 having a panel portion 26 b for holding the main PTC 12 is attached to the connecting portion 22 b. The first connection plate 26 has a central portion bent in a crank shape, and a bent portion to the screw portion 26b side has a through hole 26a formed therein. That is, the first connection plate 26 is narrowed in the through hole 26a, so that when a large current flows, the first connection plate 26 is melted at the outer periphery of the through hole 26a.

One end of the second connection plate 30 is connected to the panel 26 b. The spring portion 30a at the other end of the second connection plate 30 applies a spring pressure to the auxiliary PTC 14 and holds it. Auxiliary PTC 14 is in contact with the base of slow action bimetal 18. That is, as shown in Figs. 23 (A) and 23 (B), the panel portion 30a of the second connection plate 30, the auxiliary PTC 14 and the base of the slow action bimetal 18 and the 3 One end of the connection plate 32 is connected adjacently. The other end of the third connection plate 32 is connected to a connection portion 24 b of a terminal 24 for connection to the power supply line 98 and the main winding M (see FIG. 23 (A)). I have. The terminal 24 is formed by integrally forming a tab terminal 24a, a pin terminal 24c, and a connecting portion 24b for connecting these.

On the other hand, a movable contact 18a is provided on the distal end side of the slow action bimetal 18 and is in contact with the fixed contact 36a of the fixed contact plate 36 formed in a crank shape. The other end of the fixed contact plate 36 is fixed to a second panel 35 for holding the main PTC 12.

Here, the slow action bimetal 18 and the auxiliary PTC 14 are housed in a sealed chamber 44 formed by an L-shaped partition wall 42 provided inside the casing 40. The closed chamber 4 4 has an airtight structure. The second connecting plate 30 is through a through hole 42a provided in the partition wall 42, the third connecting plate 32 is through a through hole 42b, and the fixed contact plate 36 is a through hole 42c. The inside of the closed chamber 4 is routed through 4.

In the starter 10 of the sixth embodiment, the slow action bimetal 18 and the auxiliary PTC 14 are housed in the closed chamber 44 inside the casing 40, so that heat is hard to escape to the outside and extremely low consumption is achieved. Power can keep slow action bimetal 18 off. Furthermore, even if a flammable gas (a hydrocarbon compound such as butane) is used as the refrigerant for the hermetic compressor and the refrigerant leaks, even if the refrigerant leaks, it is stored in the hermetic chamber 44 so that the slow action bimetal 1 There is no ignition by the spark at the time of opening and closing operation of 8. Furthermore, since the auxiliary PTC 14 is in direct contact with the base of the slow-action bimetal 18, heat from the auxiliary PTC 14 can be efficiently transmitted to the slow-action bimetal 18, and the auxiliary PTC 14 with low power consumption can be used for slow action. Bimetal 18 can be kept off.

[Seventh embodiment]

Hereinafter, a seventh embodiment of the present invention will be described with reference to FIGS. 25 and 26. FIG. 26 is a circuit diagram of the activation device according to the seventh embodiment.

The circuit configuration of the activation device 10 of the seventh embodiment is the same as the activation device of the sixth embodiment described above. However, in the seventh embodiment, a normally closed snap action bimetal 16 for thermal runaway protection of the main PTC 12 is provided in series with the main PTC 12 and the slow-action bimetal 18.

Next, the operation of the seventh embodiment will be described. When the operation switch 97 is turned on, a starting current flows to the main winding M via the operation switch 97 and the overload relay 50. Also, since the main PTC 12 has a low electric resistance value (for example, about 5 Ω) at room temperature, the auxiliary PTC 12 and the series circuit of the main PTC 12 and the slow action bimetal 18 and the parallel circuit of the auxiliary PTC 14 can be used. A starting current flows, and the single-phase induction motor 100 starts.

When the starting current of the auxiliary winding S flows through the main PTC 12, the main PTC 12 and the auxiliary PTC 14 generate heat and the electric resistance value increases rapidly. As a result, the current flowing through the slow-action bimetal 18 decreases. When the auxiliary PTC 14 reaches the temperature at 140, the slow action bimetal 18 senses this and turns off, and current flows through the series circuit of the main PTC 12, the snap action bimetal 16 and the slow action bimetal 18. The flow stops, and the startup of the single-phase induction motor 100 is completed.

When the slow action bimetal 18 is turned off, current flows only to the auxiliary PTC 14, and the generated heat keeps the slow action bimetal 18 off.

Therefore, during the steady operation of the single-phase induction motor 100, no current flows through the main PTC 12, and instead, current flows through the auxiliary PTC 14, but the current flowing through the auxiliary PTC 14 is Auxiliary PTC 14 slow action bimetal 18 The power consumption of the auxiliary PTC 14 is extremely small compared with the conventional PTC thermistor, which is extremely small enough to generate heat for keeping the PTC off.

Also, during the steady-state operation of the single-phase induction motor 100, the main PTC 12 having a large heat capacity is cooled to room temperature. On the other hand, the auxiliary PTC 14 has a small heat capacity, so it cools quickly. Therefore, even when the single-phase induction motor 100 is restarted immediately after stopping, the auxiliary PTC 14 is immediately cooled down to near normal temperature, and the time required for restarting is very short, from several seconds to several tens of seconds. .

Next, before the operation of the slow-action bimetal 18 by the auxiliary PTC 14, the operation when the main PTC 12 abnormally generates heat will be described.

When the main PTC 12 abnormally generates heat and reaches a predetermined high temperature, the snap action bimetal 16 is turned off, and the current to the auxiliary winding S is cut off. For this reason, thermal runaway of the main PTC 12 results in low resistance at high temperature, and it is possible to prevent a situation in which a large current flows through the auxiliary winding S and causes dielectric breakdown. In particular, since the snap action bimetal 16 is set so as not to return at room temperature, thermal runaway of the main PTC 12 can be completely prevented.

Further, the mechanical structure of the activation device 10 according to the seventh embodiment will be described with reference to FIG. Note that the side surface of the activation device 10 of the seventh embodiment is the same as that of the above-described sixth embodiment with reference to FIG. 24, and therefore a detailed description thereof will be omitted with reference to FIG.

FIG. 25 (B) is a plan view of the single-phase induction motor starting device according to the sixth embodiment of the present invention with the lid removed, and FIG. 25 (A) is a plan view of FIG. 25 (B). Fig. 25 (C) shows a cross section taken along line A-A of Fig. 25, and Fig. 25 (C) shows a cross section taken along line CC of Fig. 25 (B). FIG. 24 (A) is a side view of FIG. 25 (B) on the side of arrow e, and FIG. 24 (B) is a side view of FIG. 25 (B) on the side of arrow d.

As shown in FIG. 25 (C), a terminal 22 connected to the auxiliary winding S shown in FIG. 26 is mounted inside the casing 40. The terminal 22 includes a tab terminal 22a, a pin terminal 22c, and a connecting portion 22b for connecting the tab terminal 22a and the pin terminal 22c. A first connection plate 26 having a panel portion 26b for holding the main PTC 12 is attached to the connection portion 22b. The first connection plate 26 has a central The through-hole 26a is formed in the bent part toward the panel part 26b side. That is, the first connection plate 26 is narrowed at the through hole 26a, so that when a large current flows, the first connection plate 26 is melted at the outer periphery of the through hole 26a.

One end of the second connection plate 30 is connected to the panel 26 b. Panel portion 30a formed at the other end of second connection plate 30 applies and applies a spring pressure to auxiliary PTC 14 and holds it. The auxiliary PTC 14 is in contact with the base of the slow action bimetal 18. That is, as shown in FIGS. 25 (A) and 25 (B), the spring portion 30 & of the second connection plate 30, the auxiliary PTC 14, the base of the slow action bimetal 18 and the One end of the three connection plate 32 is connected adjacently. The other end of the third connection plate 32 is connected to a connection part 24 b of a terminal 24 for connection to the power supply line 98 and the main winding M shown in FIG. 26 (FIG. 25 (A ) See). The terminal 24 is formed by integrally forming a tab terminal 24a, a pin terminal 24c, and a connecting portion 24 connecting these terminals.

On the other hand, a movable contact 18 a is provided on the tip side of the slow action bimetal 18, and is in contact with the movable contact 16 a of the snap action bimetal 16. The base of the snap action bimetal 16 is fixed to a second spring 35 for holding the main PTC 12. On the other hand, the casing 40 is provided with a stopper 51 extending to the tip of the snap-action bimetal 16 so that the snap action bimetal 16 does not hinder the operation of the slow action bimetal 18. Have been.

In the activation device 10 of the seventh embodiment, the movable contact 18 a of the slow action bimetal 18 directly contacts the movable contact 16 a of the snap action bimetal 16, and the slow action bimetal 18 reaches the set temperature. When the snap action bimetal 16 reaches a predetermined high temperature, it moves away from the movable contact 18 a on the slow action bimetal 18 side. When heat is applied and the slow action bimetal 18 is turned off, heat is also applied to the snap action bimetal 16 side, which moves a little away from the movable contact 18 a of the slow action bimetal 18 side. Even if a slow-action bimetal with a long life but slow operation is used, the starting current can be properly cut off. In other words, as the temperature rises, Since the barrels are in the direction of going away, it is difficult for the ring to occur. Furthermore, since both contacts are composed of movable contacts, the wiping phenomenon (rubbing) always occurs due to temperature changes, the contact portions of the movable contacts 16a and 18a are cleaned, and long contacts are made using silver contacts instead of gold plating. Lifetime can be realized. In addition, since the movable contact 18a of the slow action bimetal 18 and the movable contact 16a of the snap-action bimetal 16 are in direct contact with each other, terminals such as metal plates with fixed contacts on both sides are provided. Low cost and low resistance can be realized as compared with the case where members are interposed.

In the activation device 10 of the seventh embodiment, a stopper 51 is provided in contact with the tip end of the snap-action bimetal 16 so as not to hinder the operation of the slow-action bimetal 18. For this reason, the main PTC 12 cools down after the start is completed, and even if the snap bimetal 18 returns to room temperature, it can be prevented from bending to the slow function bimetal 16 side, and an appropriate contact interval can be maintained. Can be kept. Industrial applicability

INDUSTRIAL APPLICABILITY The present invention can be applied not only to the drive of a closed type compressor of a refrigeration cycle in a refrigerator but also to the drive of a closed type compressor of a refrigeration cycle in an air conditioner. The present invention can be implemented with appropriate modifications without departing from the gist, for example, it can be applied to all equipment using a phase induction motor as a driving source.

Claims

The scope of the claims

1. In a starting device of a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; a series connection of the auxiliary winding and the positive characteristic thermistor connected in series to sense heat from the auxiliary positive characteristic thermistor; And a snack pure bimetal that turns off when this reaches the set temperature,

A closed chamber for closing the snap action bimetal and the auxiliary positive temperature coefficient thermistor provided in the casing,

2. The snap action bimetal has a movable contact plate that oscillates a movable contact, a bimetal, and a semicircular cross section interposed between a first support point of the movable contact plate and a second support point of the bimetal. It consists of a board panel,

When the second support point is closer to the tip position side of the bimetal at a low temperature than the line connecting the fulcrum of the movable contact plate and the first support point, the plate panel connects the movable contact to the fixed contact side. Urge the movable contact plate to press against

When the second support point is closer to the distal end position of the bimetal at a high temperature than the line connecting the fulcrum of the movable contact plate and the first support point, the panel panel connects the movable contact to the fixed contact side. 2. The starting device for a single-phase induction motor according to claim 1, wherein the movable contact plate is biased so as to be separated from the movable contact plate.

3. The starting device for a single-phase induction motor according to claim 1, wherein the snap action bimetal includes a drawn bimetal.

4. The starting device for a single-phase induction motor according to claim 1, wherein the snap action bimetal includes a bimetal formed in a substantially circular shape and formed in a central portion.

5. In a starting device of a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing, A positive characteristic thermistor connected in series to the auxiliary winding; an auxiliary positive characteristic thermistor connected in parallel to the positive characteristic thermistor; and a series circuit of the auxiliary winding and the positive characteristic thermistor. A bimetal that is connected in series and senses heat from the auxiliary positive characteristic thermistor and turns off when this reaches a set temperature;

A closed chamber provided in the casing to seal the bimetal and the auxiliary positive temperature coefficient thermistor;

And a magnet for applying a magnetic force to bias the contact to the ON side with respect to the bimetal.

6. The starting device for a single-phase induction motor according to any one of claims 1 to 5, wherein the auxiliary positive characteristic capacitor is in contact with a base of the bimetal.

7. In a starting device of a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

With casing,

Positive characteristic noise connected in series with the auxiliary winding,

The auxiliary winding and a positive characteristic thermistor are connected in series with each other in series, and are turned on by being attracted by the magnetic force of the temperature-sensitive magnet and turned off by demagnetization of the temperature-sensitive magnet. A starting device for a single-phase induction motor, comprising: a closed chamber for closing a switch;

8. In a starting device of a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

Positive characteristic noise connected in series with the auxiliary winding,

The auxiliary winding and a positive temperature coefficient thermistor connected in series to the series circuit; A start switch for a single-phase induction motor, comprising: a lead switch that is turned on by the magnetic force of a magnet and turned off by demagnetization of the temperature-sensitive magnet.

9. A fuse portion which has a narrower outer peripheral portion of the through hole by forming a through hole in a predetermined portion of a conductive plate having a panel portion for holding the positive temperature thermistor with a positive force and making an electrical connection. 9. The starting device for a single-phase induction motor according to claim 1, wherein:

10. A conductive plate having a panel portion for holding the positive characteristics sensor with elastic force and making an electrical connection,

The panel portion is provided with a rectangular opening at the center of a pair of rectangular plates extending laterally, so that a pair of parallel portions and a connecting portion connecting the parallel portions have a pair of opening sides facing each other. Forming a U-shaped part, bending the pair of U-shaped parts inwardly into a U-shaped cross section,

By bending and projecting the vicinity of the tip of the parallel portion so that the connection portion is on the inside, a contact angle portion that contacts the positive characteristic thermistor is formed,

The single phase induction motor starting device according to any one of claims 1 to 9, wherein an elongated hole parallel to the parallel portion is formed at the tangent portion.

11. A conductive plate having a panel portion for holding the positive temperature coefficient thermistor with a positive force and making an electrical connection,

By bending and projecting the vicinity of the tip of the parallel portion so that the connection portion is on the inside, a contact angle portion that contacts the positive characteristic error is formed,

10. The starting device for a single-phase induction motor according to claim 1, wherein a notch parallel to the parallel portion is formed in the tangent portion.

1 2. Positive temperature thermistor connected in series with the auxiliary winding, and socket terminal for making electrical connection between the detachable connection pin, consisting of main winding and auxiliary winding In the starting device of the single-phase induction motor,

The socket terminal has a pair of plate portions extending in the axial side of the connection pin inside. And a connecting pin holding portion having a distal end separated from each other, and having a distal end formed in an arc shape so as to match the cylindrical shape of the connecting pin.

Wherein the connection pin holding portion is divided into two parts by a slit in a direction perpendicular to the axial direction of the connection pin into a first part on the tip side and a second part on the back side.

13. The single-phase induction motor according to claim 12, wherein a recess for accommodating a tip portion of the connection pin penetrating the connection pin holding portion is provided in a casing for holding the socket terminal. Starter.

14. The first portion on the distal end side of the connection pin holding portion is formed so as to hold the connection pin more gently than the second portion on the back side. 3. Single-phase induction motor starter.

15. The first portion on the distal end side of the connection pin holding portion is formed so that the length in the connection pin axial direction is longer than the second portion on the back side. 14 Single phase induction motor starter.

16. The second portion on the back side of the connection pin holding portion is formed so that the length in the connection pin axial direction is longer than the first portion on the front end side. Item 14. Single-phase induction motor starter.

17. A V-shaped notch is provided at the front end of the second portion on the back side of the connection pin holding portion, and at the tip of the pair of plate portions. 16. A single-phase induction motor starting device according to any one of 6 above.

18. A starting device and an overload protection device for a single-phase induction motor, wherein the starting device according to any one of claims 12 to 17 is provided with an overload protection device.

1 9. A starting device for a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

A casing,

Positive characteristic noise connected in series with the auxiliary winding,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; a series connection of the auxiliary winding and the positive characteristic thermistor connected in series to sense heat from the auxiliary positive characteristic thermistor; Slow action bimetal that turns off when this reaches the set temperature, A closed chamber provided in the casing, the closed chamber closing the slot action bimetal and the auxiliary corrective characteristic thermistor;

20. The starting device for a single-phase induction motor according to claim 19, wherein said auxiliary positive characteristic thermistor is in contact with a base of said mouth-to-action bimetal.

21. In a starting device of a single-phase induction motor having a main winding and an auxiliary winding energized by an AC power supply,

An auxiliary positive characteristic thermistor connected in parallel with the positive characteristic thermistor; and an auxiliary winding connected in series with the series circuit of the positive characteristic thermistor and a sensor for detecting heat from the auxiliary positive characteristic thermistor. A slow-action bimetal that turns off when this reaches the set temperature,

A snap-action bimetal that is connected in series with the series circuit of the auxiliary winding, the positive characteristic thermistor and the slow action bimetal and senses heat from the positive characteristic thermistor and turns off when the temperature reaches a predetermined high temperature; Single phase induction comprising

22. The starting device for a single-phase induction motor according to claim 21, wherein the snap action bimetal is set so as not to return at normal temperature.

23. The contact of the slow action bimetal and the contact of the snap action bimetal make direct contact,

When the slow action bimetal reaches the set temperature, it separates from the contact on the snap action bimetal side,

22. The starting device for a single-phase induction motor according to claim 21, wherein the snap action bimetal is separated from the contact on the side of the slow action bimetal when the predetermined high temperature is reached.

23. The single-phase induction motor starting device according to claim 23, wherein a stopper is provided in contact with a tip of the snap action bimetal so as not to hinder the operation of the slow action bimetal.

25. A hermetic electric compressor using the starting device according to any one of claims 19 to 24.

26. An apparatus using a hermetic electric compressor using the starting device according to any one of claims 19 to 24.